Reaming-bits for prospecting-drills.



w. T. UNDERwooD. REAMING BITS FOR PROSPECTING DRILIS.

APPLICATION FILED APR. 29, I9I4.

Patented May 4. 1915.

/I TTORNEIS THE NDRRIS PETERS COA, PHUTQLIIH'U.. WASHINGTDNA Dv C reference indicate like FFC.

WILLIAM THOMPSON UNDERWOOID, OF BIRMINGHAM, ALABAMA.

lEAlVlNG-BETS FOR PROSPECTINGr-DRILLS.

adsense.

Specification of Letters Patent.

Patented May d, 1915.

Application filed Apri129, 1914. Serial No. 835,125.

T0 all w72 om t may concern Be it known that I, VILLIAM T. UNDER WOOD, a citizen of the United States, and a resident of Birmingham, in the county of Jefferson and State of Alabama, have invented a new and useful Improvement in .leaming Bits for Prospecting Drills, of which the following is a specification.

rllhis invention relates to reamers, or eX- panding bits, for use in drilling holes for prospecting, and for other purposes, fastening bolts in a rock in order to anchor structures such as buildings, towers, bridges,tres tles, etc.

It is well known that in the art to which this invention pertains that in sinking core Y and churn drill holes, that is, holes sunk for the purpose of prospecting for coal, iron, oil or other material, often times strata bearing water, or quick sand, or soft earth vor other troublesome materials yare encountered and in such instance it is necessary to exclude'the troublesome material from the hole by means of casings or sleeves of metal disposed in the portions of the hole extending through the troublesome strata (sometimes through a cavity) and it is the principal object of this invention to provide a reamer or bit for enlarging the hole in those portions extending through troublesome strata in order to accommodate and fasten the protecting casings or sleeves.

Another object of the invention is to provide a device of the class described, including a barrel adapted to be secured to the drill pipe, a pair of cutting heads carried by resilient arms, and a wedge for separating the heads and pressing them outwardly beyond the barrel for forming the enlargement in the drill hole.

A further object of the invention is to provide a device of the class described which will be extremely simple in construction, durable, eiiicient in operation and inexpensive to manufacture.

With these and other objects in view which will become apparent as the description proceeds, the invention resides in the construction, combination and arrangement of parts hereinafter more vfully described and claimed, and illustrated in the accompanying drawing in `which like characters of parts throughout the several figures, of whic Figure l represents a side elevational view of the assembled device, showing the same used in setting the anchor rods for a structure. Referring more particularly to the drawmg, 5 indicates one ofthe sections ofthe drill pipe or stem, which is of ordinary construction, and 6 indicates the barrel of the reamer which is cylindrical in shape and of a diameter equal to the diameter of the drill pipe section, and has one end reduced and threaded as at 7 whereby it may be secured to the pipe section. The barrel is provided longitudinally throughout its length with a square or rectangular bore 8, in which are disposed the stems 9 of the cutter heads 10, said stems adjacent the heads being reduced to form resilient arms 1l. The stems, arms and heads may be formed integrally or in separate pieces. A pair of stems is disposed within the barrel, the stems being substantially rectangular in cross section, and the stems are disposed oppositely within the barrel, their meeting edges occurring transversely of the barrel diametrically thereof.

The barrel at its lower end or opposite end 7, is provided with diametrically disposed recesses l2, through which the cutter heads p 10 are adapted to extend.

upwardly from the dotted line position shown in Fig. 2, to the full line position, to enter between the cutter heads 10 for spreading the same against the tension of arms 11, and to project them in opposite directions beyond the edges of the barrel. The inner faces of the stems at the lower edges of the cutter heads are beveled as at 17, so that Athe wedge may readily enter between the cutter heads. The cutter heads have conveXed outer surfaces indicated at 18 of a curvature equal to the curvature of the barrel, and disposed in spaced vertical rows on each head are the diamonds 19.

rlhe .operation of the device may be briefly-described as follows: A troublesome stratum indicated at 21 in Fig. l, having been struck during the course of sinking the hole, the drill pipe is withdrawn and the barrel secured thereto, the stems 9 and cutter 'heads being disposed in the barrel, and the rod li being disposed between the stems, with the wedge l5 below `the cutter heads, so-'that the latter :together with the diamonds `are disposed within the recesses 12, that is, within the circumference of the barrel, and the drill ypipe is then entered and ylowered in the hole until the troublesome stratum is `encountered by the reamer. 'The rod 14 eX- tends upwardly through the :pipe sections, it being understood-that said rod may be made in segments adapted to be secured together for providing the required length ,of rod, and said rod may then be drawn upwardly by any suitable means kuntil the wedge l5, entering between ythe cutter heads, spreads the same, and as the reamer is rotated through the medium of the usual machinery, the hole is enlarged as indicated at 2O in Fig, l. lThe distance in which the wedge is entered between the cutter heads, is regulated to determine the diameter of the enlargement 20, it being understood that the farther the wedge moves between the cutter heads, the farther the latter will be spread apart, and 'hence the more the diameter of the enlargement will be increased. rlhe enlargement having been completed,ftlie wedge is lowered, whereupon the cutter heads return to their initial position, by action of the resilient arms l1, and the rea-mer can then be withdrawn from the hole.

lf a soft metal casing is used, it may be crimped or corrugated lengthwise, lowered in the hole to the place needed and then pressed downwardly and fastened in @place against the sides of `the fhole by zuse of an expansion bit constructed according to my invention but divested of the -cutting diamonds. lf 'the upper part of the `hole rhas already been protected with a casing or casings then Vthe hole can be widened or `roamed out below the level of the lowermost lcasing and other casi-ngs added at the top ofthe hole, and the string of casings driven on down to cover the vtroublesome strata.

ln Fig. (i, which shows the application of the reamer in setting anchor rods for a building or other structure, 8O lindicates #the sill or foundation of the structure, which rests on the roclr bottom indicated at 31, and 32 indicates a hole drilled'in the rock over which the sill extends, and at 38 is indicated a plurality of circular recesses or notches reamed out of the rock by an expansion bit constructed according to my invention. An anchor rod as indicated at Sii, is disposed in the drilled hole 32 and extends through or is positioned adjacent to the sill and suitably fastened thereto, the diameter kof the hole being greater `than the `diameter of .the anchor rod, and said rod is provided, as shown,

with a plurality of notches indicated at 35, and in order gto maintain the rod in immovable position the hole is filled kin around the rod with cement as indicated at 3G, which fills the hole :to the level of the sill, and enfters kthe notches yin the rod and the reamed notches 33, and which when it lhardens :immovably maintains 'the anchor rod in position.

Although I have described the preferred embodiment of my invention, I kmay desire @to make such changes in lthe construction, combination and arrangement of parts as do not .depart from the spirit of the invention and the :scope Aof the appended claims.

I claimt:

1. A device lofthe class described, comprising a barrel adapted .to be .secured ito a drill pipe section, said barrel provided `w-ith a rectangular bore extending therethrough and provided -at one end with diametricalfly opposed lrecesses communicating with .the bore, a .pair of stems substantially rectangular in cross-,section disposed within ythe bore, said stems having their lower ends reduced to form `resilient arms, oppositely disposed cutter heads on the lower kends of said resilient arms and disposed within the recesses in lthe barrel, diamonds carried by said .cutter heads, said stems provided longitudinally yof theirmeeting faces with cen- #tralfly .disposed substantially semitubular grooves forming-a .bore through the stems, a lrod disposed with the last said bore, :and a wedge carried by said rod, said wedge inormally disposed with its thin-:edge ftoward the cutter heads, said-cutter yheads at Vtheir meetzing-'edges being beveled to itorm a :guide for ,the wedge, said wedge adapted lto be entered :between said cutter heads for spreading the latter beyond .the periphery ofthe barrel. 2. A device of zthe `class described,comprising a barrel having .a squared boreeX- tending 'longitudinally and ycentrally therethrough andprovided atoneend 'with ;a pair of diametrically disposed recesses, said barrel adaptedto be secured to .a drill stem .sec-

tion, oppositely disposedncutter heads positioned within the recesses of the barrel, said cutter heads belngmovable away from each other, a rod disposed ina bore between the cutter heads and a Wedge carried by said bore adapted to be entered between the cutter heads for spreading the latter beyond the periphery of the barrel.

3. A device of the class described, comprising a hollow barrel, said barrel at one end provided with recesses, cutter heads disposed within the recesses, resilient means for maintaining said cutter heads within the recesses, and in proximity to each other, and means for entering between said cutter heads whereby to spread the latter beyond the periphery of the barrel.

4. A device of the class described, comprising a pair of cutter heads, means associated with the cutter heads for securing the latter to a drill pipe section, resilient means for normally maintaining said cutter heads within the circumference of a hole formed by the drill pipe, and means operable at will for spreading said cutter heads beyond the perimeter of the hole for enlarging the latter.

5. A device of the class described, comprising a pair of oppositely disposed cutter heads, means for securing the latter nonrotatably with relation to a drill pipe, means for normally maintaining said cutter heads in intimate relation with each other, and means for spreading the cutter heads at will.

WILLIAM THOMPSON UNDERWD.

Witnesses:

C. F. MANLY, CLEDIE OLIVER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, ID. G.

soA 

